Imaging apparatus and method of controlling the same and non-transitory computer-readable storage medium

This invention provides an imaging apparatus comprising a storage storing correction values, a correction circuit which corrects captured image data based on the correction values, a first memory and a second memory, a transferring circuit which transfers the correction values in the storage to the correction circuit, a write circuit which writes the transferred correction values to either the first memory or the second memory, and a controller which controls, in a case where a transfer time of the correction values is longer than a time for image capture processing of one frame, so that, over an image capturing period of a plurality of frames, the write circuit writes new correction values to one of the first and second memory and the correction circuit corrects the captured image data using the current correction values in the other memory.